xref: /qemu/target/microblaze/cpu.c (revision 4748be5e9df56e13045c0f76fe9f60fa7655fed7) 
1 /*
2  * QEMU MicroBlaze CPU
3  *
4  * Copyright (c) 2009 Edgar E. Iglesias
5  * Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
6  * Copyright (c) 2012 SUSE LINUX Products GmbH
7  * Copyright (c) 2009 Edgar E. Iglesias, Axis Communications AB.
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, see
21  * <http://www.gnu.org/licenses/lgpl-2.1.html>
22  */
23 
24 #include "qemu/osdep.h"
25 #include "qemu/log.h"
26 #include "qapi/error.h"
27 #include "cpu.h"
28 #include "qemu/module.h"
29 #include "hw/qdev-properties.h"
30 #include "exec/exec-all.h"
31 #include "exec/cpu_ldst.h"
32 #include "exec/gdbstub.h"
33 #include "exec/translation-block.h"
34 #include "fpu/softfloat-helpers.h"
35 #include "tcg/tcg.h"
36 
37 static const struct {
38     const char *name;
39     uint8_t version_id;
40 } mb_cpu_lookup[] = {
41     /* These key value are as per MBV field in PVR0 */
42     {"5.00.a", 0x01},
43     {"5.00.b", 0x02},
44     {"5.00.c", 0x03},
45     {"6.00.a", 0x04},
46     {"6.00.b", 0x06},
47     {"7.00.a", 0x05},
48     {"7.00.b", 0x07},
49     {"7.10.a", 0x08},
50     {"7.10.b", 0x09},
51     {"7.10.c", 0x0a},
52     {"7.10.d", 0x0b},
53     {"7.20.a", 0x0c},
54     {"7.20.b", 0x0d},
55     {"7.20.c", 0x0e},
56     {"7.20.d", 0x0f},
57     {"7.30.a", 0x10},
58     {"7.30.b", 0x11},
59     {"8.00.a", 0x12},
60     {"8.00.b", 0x13},
61     {"8.10.a", 0x14},
62     {"8.20.a", 0x15},
63     {"8.20.b", 0x16},
64     {"8.30.a", 0x17},
65     {"8.40.a", 0x18},
66     {"8.40.b", 0x19},
67     {"8.50.a", 0x1A},
68     {"9.0", 0x1B},
69     {"9.1", 0x1D},
70     {"9.2", 0x1F},
71     {"9.3", 0x20},
72     {"9.4", 0x21},
73     {"9.5", 0x22},
74     {"9.6", 0x23},
75     {"10.0", 0x24},
76     {NULL, 0},
77 };
78 
79 /* If no specific version gets selected, default to the following.  */
80 #define DEFAULT_CPU_VERSION "10.0"
81 
82 static void mb_cpu_set_pc(CPUState *cs, vaddr value)
83 {
84     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
85 
86     cpu->env.pc = value;
87     /* Ensure D_FLAG and IMM_FLAG are clear for the new PC */
88     cpu->env.iflags = 0;
89 }
90 
91 static vaddr mb_cpu_get_pc(CPUState *cs)
92 {
93     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
94 
95     return cpu->env.pc;
96 }
97 
98 static void mb_cpu_synchronize_from_tb(CPUState *cs,
99                                        const TranslationBlock *tb)
100 {
101     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
102 
103     tcg_debug_assert(!tcg_cflags_has(cs, CF_PCREL));
104     cpu->env.pc = tb->pc;
105     cpu->env.iflags = tb->flags & IFLAGS_TB_MASK;
106 }
107 
108 static void mb_restore_state_to_opc(CPUState *cs,
109                                     const TranslationBlock *tb,
110                                     const uint64_t *data)
111 {
112     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
113 
114     cpu->env.pc = data[0];
115     cpu->env.iflags = data[1];
116 }
117 
118 #ifndef CONFIG_USER_ONLY
119 static bool mb_cpu_has_work(CPUState *cs)
120 {
121     return cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI);
122 }
123 #endif /* !CONFIG_USER_ONLY */
124 
125 static int mb_cpu_mmu_index(CPUState *cs, bool ifetch)
126 {
127     CPUMBState *env = cpu_env(cs);
128     MicroBlazeCPU *cpu = env_archcpu(env);
129 
130     /* Are we in nommu mode?.  */
131     if (!(env->msr & MSR_VM) || !cpu->cfg.use_mmu) {
132         return MMU_NOMMU_IDX;
133     }
134 
135     if (env->msr & MSR_UM) {
136         return MMU_USER_IDX;
137     }
138     return MMU_KERNEL_IDX;
139 }
140 
141 #ifndef CONFIG_USER_ONLY
142 static void mb_cpu_ns_axi_dp(void *opaque, int irq, int level)
143 {
144     MicroBlazeCPU *cpu = opaque;
145     bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_DP_MASK;
146 
147     cpu->ns_axi_dp = level & en;
148 }
149 
150 static void mb_cpu_ns_axi_ip(void *opaque, int irq, int level)
151 {
152     MicroBlazeCPU *cpu = opaque;
153     bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_IP_MASK;
154 
155     cpu->ns_axi_ip = level & en;
156 }
157 
158 static void mb_cpu_ns_axi_dc(void *opaque, int irq, int level)
159 {
160     MicroBlazeCPU *cpu = opaque;
161     bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_DC_MASK;
162 
163     cpu->ns_axi_dc = level & en;
164 }
165 
166 static void mb_cpu_ns_axi_ic(void *opaque, int irq, int level)
167 {
168     MicroBlazeCPU *cpu = opaque;
169     bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_IC_MASK;
170 
171     cpu->ns_axi_ic = level & en;
172 }
173 
174 static void microblaze_cpu_set_irq(void *opaque, int irq, int level)
175 {
176     MicroBlazeCPU *cpu = opaque;
177     CPUState *cs = CPU(cpu);
178     int type = irq ? CPU_INTERRUPT_NMI : CPU_INTERRUPT_HARD;
179 
180     if (level) {
181         cpu_interrupt(cs, type);
182     } else {
183         cpu_reset_interrupt(cs, type);
184     }
185 }
186 #endif
187 
188 static void mb_cpu_reset_hold(Object *obj, ResetType type)
189 {
190     CPUState *cs = CPU(obj);
191     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
192     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(obj);
193     CPUMBState *env = &cpu->env;
194 
195     if (mcc->parent_phases.hold) {
196         mcc->parent_phases.hold(obj, type);
197     }
198 
199     memset(env, 0, offsetof(CPUMBState, end_reset_fields));
200     env->res_addr = RES_ADDR_NONE;
201 
202     /* Disable stack protector.  */
203     env->shr = ~0;
204 
205     env->pc = cpu->cfg.base_vectors;
206 
207     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
208     /*
209      * TODO: this is probably not the correct NaN propagation rule for
210      * this architecture.
211      */
212     set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status);
213     /* Default NaN: sign bit set, most significant frac bit set */
214     set_float_default_nan_pattern(0b11000000, &env->fp_status);
215 
216 #if defined(CONFIG_USER_ONLY)
217     /* start in user mode with interrupts enabled.  */
218     mb_cpu_write_msr(env, MSR_EE | MSR_IE | MSR_VM | MSR_UM);
219 #else
220     mb_cpu_write_msr(env, 0);
221     mmu_init(&env->mmu);
222 #endif
223 }
224 
225 static void mb_disas_set_info(CPUState *cpu, disassemble_info *info)
226 {
227     info->mach = bfd_arch_microblaze;
228     info->print_insn = print_insn_microblaze;
229     info->endian = TARGET_BIG_ENDIAN ? BFD_ENDIAN_BIG
230                                      : BFD_ENDIAN_LITTLE;
231 }
232 
233 static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
234 {
235     CPUState *cs = CPU(dev);
236     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(dev);
237     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
238     uint8_t version_code = 0;
239     const char *version;
240     int i = 0;
241     Error *local_err = NULL;
242 
243     cpu_exec_realizefn(cs, &local_err);
244     if (local_err != NULL) {
245         error_propagate(errp, local_err);
246         return;
247     }
248 
249     if (cpu->cfg.addr_size < 32 || cpu->cfg.addr_size > 64) {
250         error_setg(errp, "addr-size %d is out of range (32 - 64)",
251                    cpu->cfg.addr_size);
252         return;
253     }
254 
255     qemu_init_vcpu(cs);
256 
257     version = cpu->cfg.version ? cpu->cfg.version : DEFAULT_CPU_VERSION;
258     for (i = 0; mb_cpu_lookup[i].name && version; i++) {
259         if (strcmp(mb_cpu_lookup[i].name, version) == 0) {
260             version_code = mb_cpu_lookup[i].version_id;
261             break;
262         }
263     }
264 
265     if (!version_code) {
266         qemu_log("Invalid MicroBlaze version number: %s\n", cpu->cfg.version);
267     }
268 
269     cpu->cfg.pvr_regs[0] =
270         (PVR0_USE_EXC_MASK |
271          PVR0_USE_ICACHE_MASK |
272          PVR0_USE_DCACHE_MASK |
273          (cpu->cfg.stackprot ? PVR0_SPROT_MASK : 0) |
274          (cpu->cfg.use_fpu ? PVR0_USE_FPU_MASK : 0) |
275          (cpu->cfg.use_hw_mul ? PVR0_USE_HW_MUL_MASK : 0) |
276          (cpu->cfg.use_barrel ? PVR0_USE_BARREL_MASK : 0) |
277          (cpu->cfg.use_div ? PVR0_USE_DIV_MASK : 0) |
278          (cpu->cfg.use_mmu ? PVR0_USE_MMU_MASK : 0) |
279          (cpu->cfg.endi ? PVR0_ENDI_MASK : 0) |
280          (version_code << PVR0_VERSION_SHIFT) |
281          (cpu->cfg.pvr == C_PVR_FULL ? PVR0_PVR_FULL_MASK : 0) |
282          cpu->cfg.pvr_user1);
283 
284     cpu->cfg.pvr_regs[1] = cpu->cfg.pvr_user2;
285 
286     cpu->cfg.pvr_regs[2] =
287         (PVR2_D_OPB_MASK |
288          PVR2_D_LMB_MASK |
289          PVR2_I_OPB_MASK |
290          PVR2_I_LMB_MASK |
291          PVR2_FPU_EXC_MASK |
292          (cpu->cfg.use_fpu ? PVR2_USE_FPU_MASK : 0) |
293          (cpu->cfg.use_fpu > 1 ? PVR2_USE_FPU2_MASK : 0) |
294          (cpu->cfg.use_hw_mul ? PVR2_USE_HW_MUL_MASK : 0) |
295          (cpu->cfg.use_hw_mul > 1 ? PVR2_USE_MUL64_MASK : 0) |
296          (cpu->cfg.use_barrel ? PVR2_USE_BARREL_MASK : 0) |
297          (cpu->cfg.use_div ? PVR2_USE_DIV_MASK : 0) |
298          (cpu->cfg.use_msr_instr ? PVR2_USE_MSR_INSTR : 0) |
299          (cpu->cfg.use_pcmp_instr ? PVR2_USE_PCMP_INSTR : 0) |
300          (cpu->cfg.dopb_bus_exception ? PVR2_DOPB_BUS_EXC_MASK : 0) |
301          (cpu->cfg.iopb_bus_exception ? PVR2_IOPB_BUS_EXC_MASK : 0) |
302          (cpu->cfg.div_zero_exception ? PVR2_DIV_ZERO_EXC_MASK : 0) |
303          (cpu->cfg.illegal_opcode_exception ? PVR2_ILL_OPCODE_EXC_MASK : 0) |
304          (cpu->cfg.unaligned_exceptions ? PVR2_UNALIGNED_EXC_MASK : 0) |
305          (cpu->cfg.opcode_0_illegal ? PVR2_OPCODE_0x0_ILL_MASK : 0));
306 
307     cpu->cfg.pvr_regs[5] |=
308         cpu->cfg.dcache_writeback ? PVR5_DCACHE_WRITEBACK_MASK : 0;
309 
310     cpu->cfg.pvr_regs[10] =
311         (0x0c000000 | /* Default to spartan 3a dsp family.  */
312          (cpu->cfg.addr_size - 32) << PVR10_ASIZE_SHIFT);
313 
314     cpu->cfg.pvr_regs[11] = ((cpu->cfg.use_mmu ? PVR11_USE_MMU : 0) |
315                              16 << 17);
316 
317     cpu->cfg.mmu = 3;
318     cpu->cfg.mmu_tlb_access = 3;
319     cpu->cfg.mmu_zones = 16;
320     cpu->cfg.addr_mask = MAKE_64BIT_MASK(0, cpu->cfg.addr_size);
321 
322     mcc->parent_realize(dev, errp);
323 }
324 
325 static void mb_cpu_initfn(Object *obj)
326 {
327     MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
328 
329     gdb_register_coprocessor(CPU(cpu), mb_cpu_gdb_read_stack_protect,
330                              mb_cpu_gdb_write_stack_protect,
331                              gdb_find_static_feature("microblaze-stack-protect.xml"),
332                              0);
333 
334 #ifndef CONFIG_USER_ONLY
335     /* Inbound IRQ and FIR lines */
336     qdev_init_gpio_in(DEVICE(cpu), microblaze_cpu_set_irq, 2);
337     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dp, "ns_axi_dp", 1);
338     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ip, "ns_axi_ip", 1);
339     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dc, "ns_axi_dc", 1);
340     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ic, "ns_axi_ic", 1);
341 #endif
342 
343     /* Restricted 'endianness' property is equivalent of 'little-endian' */
344     object_property_add_alias(obj, "little-endian", obj, "endianness");
345 }
346 
347 static const Property mb_properties[] = {
348     /*
349      * Following properties are used by Xilinx DTS conversion tool
350      * do not rename them.
351      */
352     DEFINE_PROP_UINT32("base-vectors", MicroBlazeCPU, cfg.base_vectors, 0),
353     DEFINE_PROP_BOOL("use-stack-protection", MicroBlazeCPU, cfg.stackprot,
354                      false),
355     /*
356      * This is the C_ADDR_SIZE synth-time configuration option of the
357      * MicroBlaze cores. Supported values range between 32 and 64.
358      *
359      * When set to > 32, 32bit MicroBlaze can emit load/stores
360      * with extended addressing.
361      */
362     DEFINE_PROP_UINT8("addr-size", MicroBlazeCPU, cfg.addr_size, 32),
363     /* If use-fpu > 0 - FPU is enabled
364      * If use-fpu = 2 - Floating point conversion and square root instructions
365      *                  are enabled
366      */
367     DEFINE_PROP_UINT8("use-fpu", MicroBlazeCPU, cfg.use_fpu, 2),
368     /* If use-hw-mul > 0 - Multiplier is enabled
369      * If use-hw-mul = 2 - 64-bit multiplier is enabled
370      */
371     DEFINE_PROP_UINT8("use-hw-mul", MicroBlazeCPU, cfg.use_hw_mul, 2),
372     DEFINE_PROP_BOOL("use-barrel", MicroBlazeCPU, cfg.use_barrel, true),
373     DEFINE_PROP_BOOL("use-div", MicroBlazeCPU, cfg.use_div, true),
374     DEFINE_PROP_BOOL("use-msr-instr", MicroBlazeCPU, cfg.use_msr_instr, true),
375     DEFINE_PROP_BOOL("use-pcmp-instr", MicroBlazeCPU, cfg.use_pcmp_instr, true),
376     DEFINE_PROP_BOOL("use-mmu", MicroBlazeCPU, cfg.use_mmu, true),
377     /*
378      * use-non-secure enables/disables the use of the non_secure[3:0] signals.
379      * It is a bitfield where 1 = non-secure for the following bits and their
380      * corresponding interfaces:
381      * 0x1 - M_AXI_DP
382      * 0x2 - M_AXI_IP
383      * 0x4 - M_AXI_DC
384      * 0x8 - M_AXI_IC
385      */
386     DEFINE_PROP_UINT8("use-non-secure", MicroBlazeCPU, cfg.use_non_secure, 0),
387     DEFINE_PROP_BOOL("dcache-writeback", MicroBlazeCPU, cfg.dcache_writeback,
388                      false),
389     DEFINE_PROP_BOOL("endianness", MicroBlazeCPU, cfg.endi, false),
390     /* Enables bus exceptions on failed data accesses (load/stores).  */
391     DEFINE_PROP_BOOL("dopb-bus-exception", MicroBlazeCPU,
392                      cfg.dopb_bus_exception, false),
393     /* Enables bus exceptions on failed instruction fetches.  */
394     DEFINE_PROP_BOOL("iopb-bus-exception", MicroBlazeCPU,
395                      cfg.iopb_bus_exception, false),
396     DEFINE_PROP_BOOL("ill-opcode-exception", MicroBlazeCPU,
397                      cfg.illegal_opcode_exception, false),
398     DEFINE_PROP_BOOL("div-zero-exception", MicroBlazeCPU,
399                      cfg.div_zero_exception, false),
400     DEFINE_PROP_BOOL("unaligned-exceptions", MicroBlazeCPU,
401                      cfg.unaligned_exceptions, false),
402     DEFINE_PROP_BOOL("opcode-0x0-illegal", MicroBlazeCPU,
403                      cfg.opcode_0_illegal, false),
404     DEFINE_PROP_STRING("version", MicroBlazeCPU, cfg.version),
405     DEFINE_PROP_UINT8("pvr", MicroBlazeCPU, cfg.pvr, C_PVR_FULL),
406     DEFINE_PROP_UINT8("pvr-user1", MicroBlazeCPU, cfg.pvr_user1, 0),
407     DEFINE_PROP_UINT32("pvr-user2", MicroBlazeCPU, cfg.pvr_user2, 0),
408     /*
409      * End of properties reserved by Xilinx DTS conversion tool.
410      */
411 };
412 
413 static ObjectClass *mb_cpu_class_by_name(const char *cpu_model)
414 {
415     return object_class_by_name(TYPE_MICROBLAZE_CPU);
416 }
417 
418 #ifndef CONFIG_USER_ONLY
419 #include "hw/core/sysemu-cpu-ops.h"
420 
421 static const struct SysemuCPUOps mb_sysemu_ops = {
422     .has_work = mb_cpu_has_work,
423     .get_phys_page_attrs_debug = mb_cpu_get_phys_page_attrs_debug,
424 };
425 #endif
426 
427 #include "accel/tcg/cpu-ops.h"
428 
429 static const TCGCPUOps mb_tcg_ops = {
430     .initialize = mb_tcg_init,
431     .translate_code = mb_translate_code,
432     .synchronize_from_tb = mb_cpu_synchronize_from_tb,
433     .restore_state_to_opc = mb_restore_state_to_opc,
434 
435 #ifndef CONFIG_USER_ONLY
436     .tlb_fill = mb_cpu_tlb_fill,
437     .cpu_exec_interrupt = mb_cpu_exec_interrupt,
438     .cpu_exec_halt = mb_cpu_has_work,
439     .do_interrupt = mb_cpu_do_interrupt,
440     .do_transaction_failed = mb_cpu_transaction_failed,
441     .do_unaligned_access = mb_cpu_do_unaligned_access,
442 #endif /* !CONFIG_USER_ONLY */
443 };
444 
445 static void mb_cpu_class_init(ObjectClass *oc, void *data)
446 {
447     DeviceClass *dc = DEVICE_CLASS(oc);
448     CPUClass *cc = CPU_CLASS(oc);
449     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_CLASS(oc);
450     ResettableClass *rc = RESETTABLE_CLASS(oc);
451 
452     device_class_set_parent_realize(dc, mb_cpu_realizefn,
453                                     &mcc->parent_realize);
454     resettable_class_set_parent_phases(rc, NULL, mb_cpu_reset_hold, NULL,
455                                        &mcc->parent_phases);
456 
457     cc->class_by_name = mb_cpu_class_by_name;
458     cc->mmu_index = mb_cpu_mmu_index;
459     cc->dump_state = mb_cpu_dump_state;
460     cc->set_pc = mb_cpu_set_pc;
461     cc->get_pc = mb_cpu_get_pc;
462     cc->gdb_read_register = mb_cpu_gdb_read_register;
463     cc->gdb_write_register = mb_cpu_gdb_write_register;
464 
465 #ifndef CONFIG_USER_ONLY
466     dc->vmsd = &vmstate_mb_cpu;
467     cc->sysemu_ops = &mb_sysemu_ops;
468 #endif
469     device_class_set_props(dc, mb_properties);
470     cc->gdb_core_xml_file = "microblaze-core.xml";
471 
472     cc->disas_set_info = mb_disas_set_info;
473     cc->tcg_ops = &mb_tcg_ops;
474 }
475 
476 static const TypeInfo mb_cpu_type_info = {
477     .name = TYPE_MICROBLAZE_CPU,
478     .parent = TYPE_CPU,
479     .instance_size = sizeof(MicroBlazeCPU),
480     .instance_align = __alignof(MicroBlazeCPU),
481     .instance_init = mb_cpu_initfn,
482     .class_size = sizeof(MicroBlazeCPUClass),
483     .class_init = mb_cpu_class_init,
484 };
485 
486 static void mb_cpu_register_types(void)
487 {
488     type_register_static(&mb_cpu_type_info);
489 }
490 
491 type_init(mb_cpu_register_types)
492